Question

how many shells in Ubuntu OS?​

Answer 1

type at prompt:

$ echo $SHELL

Here is what you may see:

/bin/sh : This is the Bourne shell.

/bin/ksh93 : This is the Korn shell.

/bin/bash : This is the Bash shell.

/bin/zsh : This is the Z shell.

/bin/csh : This is the C Shell.

/bin/tcsh : This is the TC Shell.